\name{array.subset}
\alias{array.subset}
\alias{array.subset,AffyBatch-method}
\alias{array.subset,ExpressionSet-method}
\title{Given an expression object get a particular subset of arrays defined by the phenoData}
\description{
   Looks up the column named 'group' in the phenoData object to find members with a particular name and returns the specified arrays
} 

\usage{ 
  array.subset(x,group,members)
}
\arguments{
  \item{x}{expression data}
  \item{group}{the column to select on}
  \item{members}{vector of column entries to pick}
}

\value{
  An object with only the selected arrays in it
}
\references{\url{http://bioinformatics.picr.man.ac.uk/}}
\author{Crispin Miller}
\seealso{\code{\link{group.indices}}}
\keyword{misc}
\examples{ 
  \dontrun{
    #add data 
    array.subset(exprs,"group",c("a","b"))
  }
}